Go patch committed: Traverse erroneous functions redefinitions

[Ian Lance Taylor]

This patch to the Go frontend ensures that the frontend traverses
erroneous function redefinitions.  This ensures that they are lowered
as usual, which avoids some knock-on errors when definitions in them are
referenced by, e.g., nested functions within them.  Bootstrapped and ran
Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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